# Si vs LM Security

The clearest difference is iOS requirement: Si at 9.1 against LM Security's 14.0. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Si | LM Security |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | — |
| Size | 12 MB | 168 MB |
| Requires iOS | **9.1** | 14.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [旭日东方](https://appshunter.io/developer/1472957256) | [Liberty Monitors Inc](https://appshunter.io/developer/6781778556) |

## What reviewers say

### Si

[App page](https://appshunter.io/ios/app/si-link/id1484583420)

**Features:** macOS Compatibility

**In-app purchases:** none


### LM Security

[App page](https://appshunter.io/ios/app/lm-security/id6781778554)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Si free?

Si is free to download, with no in-app purchases.

### Is LM Security free?

LM Security is free to download, with no in-app purchases.

### Do Si or LM Security have ads?

Neither Si nor LM Security shows ads.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*